[alsa-devel] 24 bit sample embedded in 32 bits
vipin.kumar at st.com
Mon Jul 2 13:11:15 CEST 2012
On 7/2/2012 4:31 PM, Clemens Ladisch wrote:
> Vipin Kumar wrote:
>> I assume that the alsa framework expects the 24 bit sample data to be
>> packed one after the other.
> ALSA expects the sample data to conform to whatever sample format has
> been configured.
> Most hardware uses 32-bit sample words in memory to make the
> interface to the PCI bus easier.
>> I need to find a way to tell the framework that the data is 24bit
>> but is embedded in 32 bit.
> (HH = highest byte, LL = lowest byte, MM = middle byte)
> LL MM HH SNDRV_PCM_FORMAT_S24_3LE
> xx LL MM HH SNDRV_PCM_FORMAT_S32_LE
> LL MM HH xx SNDRV_PCM_FORMAT_S24_LE
> HH MM LL SNDRV_PCM_FORMAT_S24_3BE
> HH MM LL xx SNDRV_PCM_FORMAT_S32_BE
> xx HH MM LL SNDRV_PCM_FORMAT_S24_BE
Thanks Clemens, Jaroslav,
This was very helpful..I would try more cases and come back for more
doubts if there are any :)
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